Winter tires + chains ready to go in the trunk + drive slow and safe for every stretch of road. What constitutes a safe speed for a road changes quickly and constantly, so just plan for a nice slow and steady trip, and take it easy. Bonus: easy on the breaks (even with ABS), gear down if possible instead of breaking when it’s really slick, and if anyone passes you: try to accommodate and let them do it as safely as possible. People in a hurry are all to often the cause of crashes in inclement weather. All the best!